<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let obj = {a:1,b:2,c:3};
        console.log(Object.keys(obj));//["a", "b", "c"]

        Object.keys(obj).forEach(key =>{
            console.log(obj[key]);
        })

         // values 值 返回的是数组  
        console.log(Object.values(obj));// [1, 2, 3]

        // entries
        console.log(Object.entries(obj));
    </script>
</body>
</html>